Fill in the blanks.
1. _____ gave the laws of chemical combination.
2. _____ is a fibrous tissue with great strength but limited flexibility.
3. A free falling stone from height 10m, when reaches the earth its final velocity would be ___
ms-1
.
4. An object of mass 102g is taken upward at height 5m, then ___ joule work is done. (g=
10ms-2
)
Choose the correct option from those given below each question.
5. When the spring is compressed its potential energy _____.
(a) remains constant (b) reduces (c) increases (d) nothing can be said about it
6. What is the range of wavelength in air of audible sound waves? (When sound velocity in air
is 340 ms-1
)
(a) 0.17 m to 170 m (b) 0.17 m to 17 m (c) 0.017 m to 17 m (d) 0.017 m to 1.7 m
7. What is lacking in the meristematic tissue from the following?
(a) Dense cytoplasm (b) Nucleus (c) Cellulose (d) Vacuole
8. Animals from which class are not cold-blooded?
(a) Fishes (b) Amphibia (c) Reptilia (d) Aves
9. Who plays an important role in converting nitrites and nitrates into free nitrogen?
(a) Bacteria (b) Lichen (c) Moss (d) All the given
10. The atomic number of the element X is 8, while the atomic number of Y is 4. Hence, the
valency of these elements is ______.
(a) 1 (b) 2 (c) 3 (d) 4
11. The atomicity of K2Cr2O7 is ______.
(a) 9 (b) 11 (c) 10 (d) 12
12. The mass of an object _____ .
(a) varies at different location (b) remains constant at any location
(c) can be measured using spring balance (d) is in the direction of gravitational force
State whether the following statements are true or false.
13. The atomic radius is 10-5
times less than that of the nucleus.
14. Lizard is an animal of class Reptilia.
15. The cycle, converting saline seawater into potable water, is called water cycle.
16. The echo is heard if the time interval between the original sound and reflected one is at
least 0.1 Second.
Answers
Answered by
1
Answer:
Elements and compounds
Answered by
2
Answer:
1 . Dalton
2. tendon
5.increase
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